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ASTM A269 Durable Precision Stainless Steel Capillary Tube Seamless or Welded

China ASTM A269 Durable Precision Stainless Steel Capillary Tube Seamless or Welded

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ASTM A269 Durable Precision Stainless Steel Capillary Tube Seamless or Welded

MOQ： 1kg
Price： USD 1-10 PER PC
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Heat Treatment	Solution annealed and rapidly cooled in accordance with the governing standard
Material	Austenitic stainless steel
Standard Length	1–12 m, customizable
Wall Thickness	0.51–6.00 mm
Primary Grades	TP304, TP304L, TP316, TP316L
Outside Diameter	2.0–30.0 mm
Product	Precision stainless steel capillary tube
Manufacturing Process	Seamless cold drawn, cold rolled, welded, or welded and redrawn
Payment Terms	L/C,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability	1000 kgs per Year
Delivery Time	25-30 days
Packaging Details	packed in carton or seaworthy packing.
Brand Name	TORICH
Model Number	ASTM A269
Certification	ISO9001, ISO14001, TS16949
Place of Origin	Zhejiang, China

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Product Specification


Heat Treatment	Solution annealed and rapidly cooled in accordance with the governing standard	Material	Austenitic stainless steel
Standard Length	1–12 m, customizable	Wall Thickness	0.51–6.00 mm
Primary Grades	TP304, TP304L, TP316, TP316L	Outside Diameter	2.0–30.0 mm
Product	Precision stainless steel capillary tube	Manufacturing Process	Seamless cold drawn, cold rolled, welded, or welded and redrawn
Payment Terms	L/C,D/A,D/P,T/T,Western Union,MoneyGram	Supply Ability	1000 kgs per Year
Delivery Time	25-30 days	Packaging Details	packed in carton or seaworthy packing.
Brand Name	TORICH	Model Number	ASTM A269
Certification	ISO9001, ISO14001, TS16949	Place of Origin	Zhejiang, China
High Light	precision steel pipe ，precision seamless pipe

ASTM A269 304 310 316 Seamless or Welded Durable Precision Capillary Tube ISO

ASTM A269 precision stainless steel capillary tubing is designed for applications requiring a controlled small bore, corrosion resistance, dimensional consistency, and reliable performance at low or elevated temperatures. TP304, TP304L, TP316, and TP316L tubing can be supplied in accordance with ASTM A269/A269M for general corrosion-resistant service.

For Grade 310 or 310S, the governing specification must be selected carefully. TP310S is normally supplied under ASTM A213/A213M when seamless construction is required or ASTM A249/A249M when welded construction is required. ISO 1127 may additionally be specified for dimensional series, tolerances, and conventional mass requirements.

The tubing can be produced by seamless cold drawing, cold rolling, longitudinal welding, or welding followed by redrawing. Precision-cut short sections, straight lengths, polished surfaces, bright-annealed surfaces, and project-specific bore tolerances are available according to the final purchase drawing.

Specifications

Item	Specification
Product	Precision stainless steel capillary tube
Material	Austenitic stainless steel
Primary Grades	TP304, TP304L, TP316, TP316L
High-Temperature Grade	TP310S
ASTM Standard	ASTM A269/A269M for TP304, TP304L, TP316, and TP316L
TP310S Standard	ASTM A213/A213M for seamless tube or ASTM A249/A249M for welded tube
ISO Reference	ISO 1127 for dimensions, tolerances, and conventional masses when specified
Manufacturing Process	Seamless cold drawn, cold rolled, welded, or welded and redrawn
Outside Diameter	2.0-30.0 mm
Wall Thickness	0.51-6.00 mm
Inside Diameter	Calculated from OD and wall thickness or directly controlled according to the drawing
Standard Length	1-12 m, customizable
Precision Cut Length	10-500 mm or according to the drawing
ASTM OD Tolerance	±0.13 mm for the stated 2-30 mm OD range
ASTM Wall Tolerance	±15% for OD up to 13 mm; ±10% for OD above 13 mm up to 30 mm
Precision Tolerance	Tighter OD, wall, or ID tolerance subject to dimensional review and written order confirmation
Straightness	Defined by purchase agreement; ≤1.0 mm per metre can be specified for suitable straight-length sizes
Surface Condition	Bright annealed, annealed and pickled, polished, passivated, or customer-specified
Heat Treatment	Solution annealed and rapidly cooled in accordance with the governing standard
Typical Solution Temperature	Minimum 1040°C for the listed grades, subject to the governing specification
End Condition	Plain, square cut, deburred, chamfered, cleaned, or capped
Inspection	Dimensional inspection, surface inspection, hardness testing, forming tests, and hydrostatic or nondestructive electric testing as applicable
Documentation	Material test certificate containing heat number, chemical composition, heat treatment, dimensions, and ordered test results

The listed OD and wall ranges are production ranges and cannot be combined arbitrarily. The minimum achievable inside diameter depends on the selected OD, wall thickness, grade, manufacturing route, and required tolerance.

Main Features

Controlled Capillary Bore

The tube can be ordered by OD and wall thickness or by OD and controlled ID. For flow restriction, sensor response, dosing, or pressure transmission applications, direct ID inspection can be specified instead of relying only on a calculated nominal bore.

ASTM A269 permits relatively broad wall tolerances, particularly for tubes up to 13 mm OD. Applications sensitive to internal volume or flow rate should therefore state the required ID tolerance, wall eccentricity, and measurement method on the purchase drawing.

Grade-Specific Corrosion Performance

TP304 and TP304L contain 18.0-20.0% chromium and provide reliable oxidation and corrosion resistance for general industrial environments.

TP316 and TP316L contain 2.00-3.00% molybdenum. This addition improves resistance to localized corrosion and pitting compared with molybdenum-free TP304 grades, particularly where chlorides or chemically contaminated condensate may be present.

TP304L and TP316L have lower maximum carbon contents than TP304 and TP316. They are commonly selected when the tubing will be welded or exposed to conditions where resistance to intergranular corrosion after welding is important.

High-Temperature TP310S Option

TP310S contains 24.0-26.0% chromium and 19.0-22.0% nickel. Its higher chromium and nickel contents provide improved oxidation resistance and a stable austenitic structure for elevated-temperature service.

TP310S should not be described as ASTM A269 tubing without an agreed supplementary specification. Seamless TP310S tubing should normally be ordered to ASTM A213/A213M, while welded TP310S tubing should normally be ordered to ASTM A249/A249M.

Verified Heat Treatment and Hardness

The tubing is supplied in the solution-annealed condition. Proper solution annealing restores corrosion resistance after cold working and controls final hardness and formability.

For TP304, TP304L, TP316, and TP316L under ASTM A269, the maximum hardness is 192 HBW, 200 HV, or 90 HRB. Comparable limits apply to TP310S under the relevant ASTM heat-exchanger tube specification.

Our Advantages

Correct Grade and Standard Matching

A common purchasing problem is listing TP310S together with ASTM A269 without verifying whether the grade is included in that standard. Before production, the grade, manufacturing route, service condition, and inspection requirements are reviewed together.

TP304, TP304L, TP316, and TP316L are assigned to ASTM A269 for general-service tubing. TP310S is assigned to ASTM A213 for seamless construction or ASTM A249 for welded construction. This prevents certificates from showing a grade-standard combination that does not match the governing ASTM specification.

Declared Tolerances Instead of a General "Precision" Claim

ASTM A269 dimensional tolerances may not be sufficiently narrow for capillary flow control, miniature fittings, sensor housings, or automatic assembly.

The order specification can separately define OD tolerance, wall tolerance, minimum ID, ID tolerance, ovality, wall eccentricity, straightness, cut-length tolerance, and burr height. The confirmed manufacturing tolerance is recorded on the quotation and purchase document rather than being replaced by an undefined "high precision" description.

Inspection Adapted to Miniature Tube Sizes

ASTM A269 states that its mechanical-property requirements do not apply to tubing smaller than 3.2 mm inside diameter or 0.38 mm wall thickness. Hardness testing is also impractical on certain miniature dimensions.

For such sizes, the purchase specification can define alternative inspection methods, including tensile testing under an agreed standard, microhardness testing, dimensional sampling frequency, air leakage testing, hydrostatic testing, eddy-current testing, surface cleanliness inspection, and direct bore measurement. The applicable method is confirmed before production.

Execution Standards

Standard System	Applicable Reference
ASTM	ASTM A269/A269M for seamless and welded austenitic stainless steel tubing for general service
ASTM for TP310S	ASTM A213/A213M for seamless TP310S tubing; ASTM A249/A249M for welded TP310S tubing
ISO	ISO 1127 for stainless steel tube dimensions, dimensional tolerances, and conventional mass
EN	EN 10216-5 for seamless stainless steel pressure tubes; EN 10217-7 for welded stainless steel pressure tubes
JIS	JIS G 3459 for stainless steel pipes used for corrosion-resistant, low-temperature, and high-temperature piping
GB	GB/T 14976-2025 for seamless stainless steel pipes for fluid transport; GB/T 12771-2019 for welded stainless steel pipes for fluid transport
GOST	GOST 9941-2022 for seamless cold-formed tubes made from corrosion-resistant high-alloy steels

Application

High-Temperature Thermocouple Probe Sheath

Precision stainless steel capillary tubing can be used as the protective outer sheath of an industrial thermocouple temperature probe.

TP304 or TP304L is suitable for general industrial temperature probes operating in relatively clean environments. TP316 or TP316L is preferred when the probe is exposed to moisture, process chemicals, or chloride-containing condensate. TP310S can be selected for the heated section of a probe where increased oxidation resistance is required.

For this product, the critical purchasing parameters are the tube OD, minimum ID, wall eccentricity, straightness, surface condition, closed-end forming requirement, sensor insertion clearance, and final cut length.

Chemical Composition

Grade	UNS	Governing Standard	C	Mn	Si	P	S	Cr	Ni	Mo
TP304	S30400	ASTM A269	≤0.08	≤2.00	≤1.00	≤0.045	≤0.030	18.0-20.0	8.0-11.0	--
TP304L	S30403	ASTM A269	≤0.035	≤2.00	≤1.00	≤0.045	≤0.030	18.0-20.0	8.0-12.0	--
TP310S	S31008	ASTM A213 or A249	≤0.08	≤2.00	≤1.00	≤0.045	≤0.030	24.0-26.0	19.0-22.0	--
TP316	S31600	ASTM A269	≤0.08	≤2.00	≤1.00	≤0.045	≤0.030	16.0-18.0	10.0-14.0	2.00-3.00
TP316L	S31603	ASTM A269	≤0.035	≤2.00	≤1.00	≤0.045	≤0.030	16.0-18.0	10.0-15.0	2.00-3.00

Mechanical Properties

Grade	Tensile Strength, Min.	0.2% Yield Strength, Min.	Elongation in 50 mm, Min.	Hardness, Max.	Solution Temperature, Min.
TP304	515 MPa	205 MPa	35%	192 HBW / 200 HV / 90 HRB	1040°C
TP304L	485 MPa	170 MPa	35%	192 HBW / 200 HV / 90 HRB	1040°C
TP310S	515 MPa	205 MPa	35%	192 HBW / 200 HV / 90 HRB	1040°C
TP316	515 MPa	205 MPa	35%	192 HBW / 200 HV / 90 HRB	1040°C
TP316L	485 MPa	170 MPa	35%	192 HBW / 200 HV / 90 HRB	1040°C

Frequently Asked Questions

Q: Are you trading company or manufacturer?

A: Manufacturer, also can do trading.

Q: How long is your delivery time?

A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples? is it free or extra?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment?

A: Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.

Company Details

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Employee Number:

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